/*
 * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package jdk.graal.compiler.core.test.ea;

import org.junit.Assert;
import org.junit.Test;

import jdk.graal.compiler.core.test.GraalCompilerTest;
import jdk.graal.compiler.nodes.StructuredGraph;
import jdk.graal.compiler.nodes.StructuredGraph.AllowAssumptions;
import jdk.graal.compiler.nodes.memory.WriteNode;
import jdk.graal.compiler.phases.common.CanonicalizerPhase;
import jdk.graal.compiler.phases.common.FloatingReadPhase;
import jdk.graal.compiler.phases.common.HighTierLoweringPhase;

public class WriteIndirectCanonicalizationTest extends GraalCompilerTest {

    static int field;

    public static int foo(int val) {
        field = val;
        int read = field;

        field = read;
        int read1 = field;

        field = read1;
        int read2 = field;

        field = read2;
        int read3 = field;

        return read3;
    }

    @Test
    public void test() {
        StructuredGraph g = parseEager(getResolvedJavaMethod("foo"), AllowAssumptions.YES);
        CanonicalizerPhase canonicalizer = CanonicalizerPhase.create();
        new HighTierLoweringPhase(canonicalizer, true).apply(g, getDefaultHighTierContext());
        new FloatingReadPhase(canonicalizer).apply(g, getDefaultMidTierContext());
        Assert.assertEquals(1, g.getNodes(WriteNode.TYPE).count());
    }
}
